Crushed Coral Bio Filter Media for Marine and Freshwater Fish

If you need to stabilise pH and support biological filtration in a marine reef or hard-water freshwater aquarium, this crushed coral filter media is designed for that purpose. As a filter media it helps to buffer the tank toward a pH of 8.2-8.3 while providing a porous surface for beneficial bacteria, making it suitable for reef setups and freshwater systems that require higher pH, such as African cichlid tanks.

The pieces vary in size from small to several centimetres, so they are large enough for use in most external filter trays or sump tanks without passing through coarse filter baskets. In practical terms the crushed coral will also help maintain general and carbonate hardness levels, which reef tanks and many hard-water freshwater setups rely on. For dosing, follow the guidance of around 100g per 100 litres of water to achieve buffering effects that support more consistent water chemistry. Unlike inert ceramic bio-media, crushed coral actively alters water chemistry as well as providing biological filtration, so use with systems that benefit from increased KH and hardness.

Key Features

• Natural pH buffer – helps maintain pH around 8.2-8.3 for marine and hard-water freshwater tanks
• Biological filter media – porous surface supports beneficial bacteria for biological filtration
• Suitable for sumps and external filter trays – pieces are large enough to stay in standard trays
• Helps buffer GH and KH – practical benefit for reef setups and African cichlid systems
• Simple dosing guidance included – use approximately 100g per 100 litres to achieve buffering effect

Frequently Asked Questions

Is this crushed coral suitable for African cichlids?

Yes. This crushed coral is suitable for freshwater tanks needing higher pH, such as African cichlids. It buffers water to around pH 8.2 to 8.3 and helps stabilise GH and KH.

Can it be used in marine reef tanks?

Yes. It is suitable for marine tanks and reef bio filtration, acting as a natural pH buffer and biological filter media.

How much should I add for biological filtration?

Use about 100g per 100 litres of water when using as biological media, as recommended. This provides effective bio surface area for filtration in tanks or sumps.

What sizes are the pieces and will they fit my filter tray?

Pieces vary from 1cm to 6cm in size. Their relatively large size means they can be used in most external filter trays or sump tanks.

Will this change my tank water chemistry?

Yes. Crushed coral is a natural pH buffer and will help raise and maintain pH around 8.2 to 8.3 while also helping to buffer GH and KH levels.

Check the recent prices for Crushed Coral Filter Media for Aquariums below.